Design and Implementation Of a Separate Control Driven High Current Synchronous Rectified Forward Converter with Non-Dissipative Snubber Reset

This paper explains the techniques employed in forward converter to maximize the efficiency for a high current output. Usually with high current (>10A), forward converter will have significant diode conduction losses occurring at the secondary side, to minimize it Synchronous Rectification (SR) technique has been adapted with each diode replaced with two SR MOSFETS connected. Lossless snubber is connected across primary MOSFET for resetting of flux in Toff period there by achieving wide range of duty cycle operations. Also, it reduces the voltage stress imposed on the MOSFET and provides zero turnoff switching. Operations and design considerations of the employed techniques are studied. A forward converter has been designed to operate at switching frequency of 100 KHz for 5V/30A output with wide input voltage range of 16V to 45V. The hardware is developed for the proposed design and tested for performance parameters. The results obtained are well within the specified values.